Automatic Knife Experts from Texas The Microtech HALO: The OTF Knife That Went to War The Problem: Cutting Free at 25,000 Feet A HALO jump — High Altitude, Low Opening — drops a soldier from 25,000 feet or higher. They freefall for minutes before opening their parachute at dangerously ... Knife Collecting Knife History OTF Knives Jun 12, 2025